Lasse Vigen Christensen admits Fulham struggled to deal with the high intensity start made by Brentford as Slavisa Jokanovic’s men crashed to defeat at Griffin Park.
The Whites were two goals down in seven minutes after early strikes from Sam Saunders and Scott Hogan.
Hogan then added a third five minutes before half time to wrap up an emphatic victory for the Bees.
And Christensen believes the Whites were undone by the hosts’ whirlwind start to the derby match.
He said: “It happened quite quick. Right from the start it was even, but then it dropped for them in situations.
“We were not really able to handle the through balls and them running from deep. It is hard to say exactly what it was but as a team we just did not defend well enough.
“Obviously it was not a good performance . It was a bad game from the start - we never really got into it. They punished us for some of our mistakes, we were not defending well enough.
“From then on, it was just a tough game and we struggled to really get going.
“We can only excuse the performance that we put on - it simply was not good enough.”
Fulham enjoyed a slightly more successful second half, not conceding and creating several chances after the introduction of Moussa Dembele and Emerson Hyndman.
Ross McCormack was denied by the crossbar and Dembele was blocked by Yoann Barbet after delaying his shot.
And the 21-year-old midfielder says Jokanovic got stuck into his charges during the break.
Christensen added: “Yeah, he said something.
“He tried to get into our pride, which was obviously understandable because as a team we knew it wasn't good enough.
“In the second half we came out probably a little bit more determined to at least not to make it worse for ourselves.
“I don't think at any point we really played anywhere near what we can do, it was just one of those days.”
The youngster was substituted during the second half after picking up an injury, which has epitomised the stop-start season he has endured.
But his latest injury was just a knock, the Dane confirmed.
He said: “It's not too bad, it is just a knock. I didn't really want to come off, but I couldn't run on it, I gave it a shot for a few minutes but it was only getting worse.
“It has just been one of those seasons.”